Ok that space is better, I was calculating it from 900 deep shower + 600 deep vanity = 1500. Wall width is 2100.
tall towel rail is good, also vanity drawer. Is still be worked about the 150mm to get in to clean the glass screen, esp if you WC pan is square.
If I were you I’d mock up the room with random bits if stiff and move around it in. Esp the 2.1 M high pillar for your shower cubicle right in the middle.